Correct getBI hack.
Correct getBI hack.

Apparently we can't rely on get_attribute_native to only get BigIntegers, so we
actually look for one.

cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp